$560 Cheap Flights from Washington (DCA) to Phnom Penh (PNH)

View $560 flight on Sun, Aug 17, 2025Opens in a new window

Popular airlines from Ronald Reagan Washington National Airport (DCA) to Phnom Penh Intl. Airport (PNH)

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Washington to Phnom Penh (DCA-PNH)

Prices were available within the past 7 days and start at $560 for one-way flights and $1,045 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sun, Aug 31 - Tue, Sep 9
DCA
Washington
PNH
Phnom Penh
$1,045 Roundtrip, found 9 hours ago
$1,045
Roundtrip
found 9 hours ago
Select Delta flight, departing Sun, Aug 31 from Washington to Phnom Penh, returning Tue, Sep 9, priced at $1,045 found 9 hours ago
Korean Air
Sun, Jan 18 - Sun, Jan 25
DCA
Washington
PNH
Phnom Penh
$1,050 Roundtrip, found 20 hours ago
$1,050
Roundtrip
found 20 hours ago
Select Korean Air flight, departing Sun, Jan 18 from Washington to Phnom Penh, returning Sun, Jan 25, priced at $1,050 found 20 hours ago
Delta
Sun, Jan 18 - Sun, Jan 25
DCA
Washington
PNH
Phnom Penh
$1,051 Roundtrip, found 20 hours ago
$1,051
Roundtrip
found 20 hours ago
Select Delta flight, departing Sun, Jan 18 from Washington to Phnom Penh, returning Sun, Jan 25, priced at $1,051 found 20 hours ago
Korean Air
Sun, Jan 18 - Sun, Jan 25
DCA
Washington
PNH
Phnom Penh
$1,055 Roundtrip, found 20 hours ago
$1,055
Roundtrip
found 20 hours ago
Select Korean Air flight, departing Sun, Jan 18 from Washington to Phnom Penh, returning Sun, Jan 25, priced at $1,055 found 20 hours ago
Alaska Airlines
Fri, Aug 22 - Thu, Sep 4
DCA
Washington
PNH
Phnom Penh
$1,166 Roundtrip, found 3 days ago
$1,166
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Fri, Aug 22 from Washington to Phnom Penh, returning Thu, Sep 4, priced at $1,166 found 3 days ago
Cathay Pacific
Thu, Aug 28 - Tue, Oct 28
DCA
Washington
PNH
Phnom Penh
$1,181 Roundtrip, found 5 days ago
$1,181
Roundtrip
found 5 days ago
Select Cathay Pacific flight, departing Thu, Aug 28 from Washington to Phnom Penh, returning Tue, Oct 28, priced at $1,181 found 5 days ago
Delta
Fri, Jul 25 - Wed, Aug 6
DCA
Washington
PNH
Phnom Penh
$1,185 Roundtrip, found 6 hours ago
$1,185
Roundtrip
found 6 hours ago
Select Delta flight, departing Fri, Jul 25 from Washington to Phnom Penh, returning Wed, Aug 6, priced at $1,185 found 6 hours ago
JetBlue Airways
Sun, Aug 31 - Mon, Sep 8
DCA
Washington
PNH
Phnom Penh
$1,186 Roundtrip, found 4 days ago
$1,186
Roundtrip
found 4 days ago
Select JetBlue Airways flight, departing Sun, Aug 31 from Washington to Phnom Penh, returning Mon, Sep 8, priced at $1,186 found 4 days ago
JetBlue Airways
Sun, Jan 18 - Sun, Jan 25
DCA
Washington
PNH
Phnom Penh
$1,188 Roundtrip, found 20 hours ago
$1,188
Roundtrip
found 20 hours ago
Select JetBlue Airways flight, departing Sun, Jan 18 from Washington to Phnom Penh, returning Sun, Jan 25, priced at $1,188 found 20 hours ago
Delta
Sat, Jul 26 - Wed, Aug 6
DCA
Washington
PNH
Phnom Penh
$1,191 Roundtrip, found 6 hours ago
$1,191
Roundtrip
found 6 hours ago
Select Delta flight, departing Sat, Jul 26 from Washington to Phnom Penh, returning Wed, Aug 6, priced at $1,191 found 6 hours ago
Flights from Washington (DCA) to Phnom Penh (PNH)
Origin airport
Ronald Reagan Washington National
Destination airport
Phnom Penh Intl.
Airlines serving
Cathay Pacific, Delta, Korean Air, Singapore Airlines, United
Roundtrip price
$1,044
Distance
8951 mi

Washington to Phnom Penh Flights

The cheapest times to fly from Washington to Phnom Penh

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Phnom Penh are during the month of August. You can find some of the cheapest flights from Washington to Phnom Penh with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Phnom Penh

Sunday is one of the best days to book for cheap flights from Washington to Phnom Penh: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to Phnom Penh

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Phnom Penh in 2025. You can also book with separate airlines for your outbound and return journeys, from $560 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Phnom Penh flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to Phnom Penh airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Ronald Reagan Washington National Airport (DCA) to Phnom Penh Intl. Airport (PNH) cost?
Discover the latest flight deals from DCA to PNH by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from DCA to PNH?
The cheapest flights from DCA to PNH are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from DCA to PNH?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from DCA to PNH. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Ronald Reagan Washington National Airport (DCA) to Phnom Penh Intl. Airport (PNH)?
You'll have to catch a flight with a layover if you're traveling from Ronald Reagan Washington National Airport (DCA) to Phnom Penh Intl. Airport (PNH). There are no daily direct flights on this route. However, simply filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from DCA to PNH?
Typically you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* But this can vary depending on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Ronald Reagan Washington National Airport (DCA) to Phnom Penh Intl. Airport (PNH)?
To land at Phnom Penh Intl. Airport (PNH) on schedule, book a flight that leaves from Ronald Reagan Washington National Airport (DCA) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Ronald Reagan Washington National Airport (DCA) to Phnom Penh Intl. Airport (PNH) last-minute?
Waiting until just before your trip to book your flight from DCA to PNH often results in higher prices. While it's possible to find some last-minute discounts, they're not always guaranteed. Be flexible with your travel plans for the best chance of snagging a bargain.
Is it cheaper to book a DCA to PNH flight and hotel package?
You'll typically save money by booking a DCA to PNH flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one place. Once you've chosen your preferred accommodations and flights, you can add extras such as car rentals, activities and tours.
Can I cancel or change the date of my flight from Ronald Reagan Washington National Airport (DCA) to Phnom Penh Intl. Airport (PNH)?
In most cases, you can modify or cancel your DCA to PNH flight. However, there may be additional fees, especially if you booked more than 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you need more details, go to our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.